Carburetor attachment



Sept. 29, 1931.

J. F. CULLIN CARBURETOR ATTACHMENT Filed March 21/ 1930 L INVENTOR.

#M 0. WQmzi f ATTORNEY.

Patented Sept. 29,19 1

UNITED STATES PATENT OFFICE 1mm; 1?. comm, or nn'rnorr,

MICHIGAN, ASBIGNOB TO WILLIAM J. HART'WIG, OI DmOIT, MICHIGAN CABBUBETOB ATTACHMENT I Application filed latch 21, 1980. Serial No. 437,890.

present invention to carburetor against the top ofthe float to de- I 15 press the same and increase the pressure in the chamber thereby to force an additional quantity of fuel thru the fuel jet into the intake manifoldwhen the throttle rod is moved rapidly toward open throttle position, said .0 means causing no such increase of pressure when the throttle rod is operated slowly.

Other objects will readily. occur to those skilled in the art upon reference to the following description and the accompanying as drawings in which 1 Fig. 1 is a plan view of the present device as mounted upon a carburetor.

Fig. 2 is a view in elevation of the present invention mounted upon the carburetor.

80 Fig. 3 is a section on line 3-3 of Fig. 1.

Referring to the drawings, there is shown in Fig. 1 a carburetor A having the usual throttle rod B for operating the throttle valve of the latter, the carburetor being connected to the intake manifold C of the engine by means of the usual flanges A and C connected by means of the bolts D. The construction thus far described is more or less conventional and forms no part of the present invention.

Attached to the flange C by means of the bolts D is a bracket having attaching ears 11 and supporting ears 12 and 13 extending therefrom. The support 13 is curled as shown in Fig. 3 to form a housing 15 for the cylindrical casing 16 in which is disposed a plunger 17, adapted tobe engaged by the I throttle rod B, a spring 18' urging the plunger towards its outward position. The

60 rear end of the casing is pneumatically connected to the float chamber of the carburetor A by means of the connection 20 which, in the form shown, includes a threaded nipple and a rubber hose, the carburetor being provided with the usual vent 21.

The operation of the present device is as follows :When the throttle rod is slowly depressed by the driver of the automobile in response to his desire for more speed or power from the engine and therefore a greater fuel flow to the enfine (not shown) the plunger 17 will be force inwardly in the casing 16 compressing the air in the space 22, but such air I escapes to the atmosphere as quickly as compressed, thru the connection 20 and the vent 21 leading fromthe float chamber of the carburetor. However, when there is a need for quick acceleration of the engine, the fuel mixture must be temporarily enriched and the plunger will be forced inwardly, very. rapidly compressing the air in the space 22 at a much greater rate than the latter can escape from the vent 21. The compressed air then builds up a pressure in the float chamber of the carburetor which causes, by means of certain well known hydraulic principles, a rush of fluid to the engine thru the valve which has been opened by the operating means B. At the same time the air jet directed into the float chamber, impinges on the float 23 and causes the latter to be depressed, thereby admitting more fuel into the float bowl itself.

The spring 18 causes the return of the. plunger 17 when the operating means B is released, and during this return stroke, air enters the space 22 thru vent 21 and connection 20.

It will be observed, therefore, that Ihave provided a device conveniently attachable to a carburetor and which responds to ra id movements of the carburetor throttle r0 to cause a temporary enrichment of the fuel mixture.

Now having described the invention and the preferred embodiment thereof, it is to be understood that the said invention is to be limited, not to the specific details herein set v forth, but only by the scope of the claim which follows.

I claim a In combination with a carburetor having a float bowland a discharge nozzle having a flanged upper end adapted to engage the flanged lovver end of a pipe leading to the intake manifold of an engine, bolts securing the flanged ends aforesaid to each other, an element fixedly secured to the carburetor and having a portion extending outwardly from the flanges and having a part formed to provide a horizontal cylinder 1 having an open end, a casing in said cylinder and havin one openend,a horizontally reciprocatin piston in said casing having a ortionprojectlngthru the open end of the casing and a coiled tension resisting spring connected to the projecting portion of the piston, the carburetor and a throttle rod connected to the arm, the parts being so disposed with respect to one another that the end of the rod engages the projecting portion of the piston, the casing being pneumatically connected to the float chamber of the carburetor.

JASPER F. CULLIN. 

